package reese.think_in_java.java_21_thread;

import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

/**
 * ***********************************************************
 *
 * @类名 : reese.think_in_java.java_21_thread.类名
 * @DESCRIPTION : 这家伙太懒啥都没写
 * @AUTHOR :  一个风情万种的男子
 * @DATE : 2016/6/4
 * ***********************************************************
 */

class SleepBlocked implements Runnable {
    public void run() {
        try {
            TimeUnit.SECONDS.sleep(100);
        } catch(InterruptedException e) {
            System.out.println("InterruptedException");
        }
        System.out.println("Exiting SleepBlocked.run()");

    }

}

class IOBlocked implements Runnable {
    private InputStream in;
    public IOBlocked(InputStream is) { in = is; }
    public void run() {
        try {
            System.out.println("Waiting for read():");
            in.read();
        }catch(IOException e) {
            if(Thread.currentThread().isInterrupted()) {
                System.out.println("Interrupted from blocked I/O");
            } else {
                throw new RuntimeException(e);
            }
        }
        System.out.println("Exiting IOBlocked.run()");
    }
}

class SynchronizedBlocked implements Runnable {
    public synchronized void f() {
        while(true) // Never releases lock
            Thread.yield();
    }
    public SynchronizedBlocked() {
        new Thread() {
            public void run() {
                f(); // Lock acquired by this thread
            }
        }.start();
    }
    public void run() {
        System.out.println("Trying to call f()");
        f();
        System.out.println("Exiting SynchronizedBlocked.run()");
    }
}

public class Interrupting {

    private static ExecutorService exec =
            Executors.newCachedThreadPool();

    static void test(Runnable r) throws InterruptedException{
        Future<?> f = exec.submit(r);
        TimeUnit.MILLISECONDS.sleep(100);
        System.out.println("Interrupting " + r.getClass().getName());
        f.cancel(true); // Interrupts if running
        System.out.println("Interrupt sent to " + r.getClass().getName());
    }

    public static void main(String[] args) throws Exception {
        test(new SleepBlocked());
        test(new IOBlocked(System.in));
        test(new SynchronizedBlocked());
        TimeUnit.SECONDS.sleep(3);
        System.out.println("Aborting with System.exit(0)");
        System.exit(0); // ... since last 2 interrupts failed
    }

}
